Perhaps, by mating the search engine of each ACS community with
something like JXTA search so a search in one ACS community can then
spawn parallel queries in other related ACS communities, hopefully,
resulting in a more dynamic ACS community network...
Say, in the Greenpeace example, they can tie in other ACS-based sites,
both Greenpeace and other NGOs, and they can automatically,
cross-search each other.
Just a thought...